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Difference between Cost someone a fortune and Cost someone dear

cost someone a fortunecost a person a large sum of money:

  1. See, Janet, this huge yellow rose wreath here from Mrs. Pettigrew. It must have cost her a fortune.

cost someone dearseriously affect smb.’s health, prestige, etc. (with the implication that the person is himself responsible):

  • Politically, this absent-mindedness was to cost him dear.